diff options
author | Alex Shi <alex.shi@linaro.org> | 2017-06-30 14:26:31 +0800 |
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committer | Alex Shi <alex.shi@linaro.org> | 2017-06-30 14:26:31 +0800 |
commit | 78278fb152735c686cb13e1ae3bcee78fc2cd154 (patch) | |
tree | ed3f669fbb4422bf3dfaa6b20ea992c04c1eac01 /include/linux/mm.h | |
parent | 084eedbddaa526f53b20291ee7176be269620301 (diff) | |
parent | 92905e331aea278665c4b27fbb13c4547a8bcbb0 (diff) |
Merge tag 'v4.9.35' into linux-linaro-lsk-v4.9lsk-v4.9-17.06
This is the 4.9.35 stable release
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r-- | include/linux/mm.h | 53 |
1 files changed, 25 insertions, 28 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 0b5b2e4df14e..6c9e1ad12831 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1356,39 +1356,11 @@ int clear_page_dirty_for_io(struct page *page); int get_cmdline(struct task_struct *task, char *buffer, int buflen); -/* Is the vma a continuation of the stack vma above it? */ -static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) -{ - return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); -} - static inline bool vma_is_anonymous(struct vm_area_struct *vma) { return !vma->vm_ops; } -static inline int stack_guard_page_start(struct vm_area_struct *vma, - unsigned long addr) -{ - return (vma->vm_flags & VM_GROWSDOWN) && - (vma->vm_start == addr) && - !vma_growsdown(vma->vm_prev, addr); -} - -/* Is the vma a continuation of the stack vma below it? */ -static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) -{ - return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); -} - -static inline int stack_guard_page_end(struct vm_area_struct *vma, - unsigned long addr) -{ - return (vma->vm_flags & VM_GROWSUP) && - (vma->vm_end == addr) && - !vma_growsup(vma->vm_next, addr); -} - int vma_is_stack_for_current(struct vm_area_struct *vma); extern unsigned long move_page_tables(struct vm_area_struct *vma, @@ -2127,6 +2099,7 @@ void page_cache_async_readahead(struct address_space *mapping, pgoff_t offset, unsigned long size); +extern unsigned long stack_guard_gap; /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ extern int expand_stack(struct vm_area_struct *vma, unsigned long address); @@ -2155,6 +2128,30 @@ static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * m return vma; } +static inline unsigned long vm_start_gap(struct vm_area_struct *vma) +{ + unsigned long vm_start = vma->vm_start; + + if (vma->vm_flags & VM_GROWSDOWN) { + vm_start -= stack_guard_gap; + if (vm_start > vma->vm_start) + vm_start = 0; + } + return vm_start; +} + +static inline unsigned long vm_end_gap(struct vm_area_struct *vma) +{ + unsigned long vm_end = vma->vm_end; + + if (vma->vm_flags & VM_GROWSUP) { + vm_end += stack_guard_gap; + if (vm_end < vma->vm_end) + vm_end = -PAGE_SIZE; + } + return vm_end; +} + static inline unsigned long vma_pages(struct vm_area_struct *vma) { return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |